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4459 decky 1
/*
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 * Copyright (c) 2009 Martin Decky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ns
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 * @{
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 */
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#include <ipc/ipc.h>
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#include <ipc/services.h>
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#include <libadt/list.h>
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#include <bool.h>
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#include <errno.h>
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#include <assert.h>
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#include <stdio.h>
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#include <malloc.h>
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#include "clonable.h"
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#include "ns.h"
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/** Request for connection to a clonable service. */
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typedef struct {
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    link_t link;
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    ipcarg_t service;
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    ipc_call_t call;
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    ipc_callid_t callid;
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} cs_req_t;
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/** List of clonable-service connection requests. */
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static link_t cs_req;
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int clonable_init(void)
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{
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    list_initialize(&cs_req);
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    return EOK;
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}
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/** Return true if @a service is clonable. */
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bool service_clonable(int service)
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{
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    return (service == SERVICE_LOAD);
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}
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/** Register clonable service.
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 *
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 * @param service Service to be registered.
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 * @param phone   Phone to be used for connections to the service.
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 * @param call    Pointer to call structure.
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 *
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 */
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void register_clonable(ipcarg_t service, ipcarg_t phone, ipc_call_t *call,
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    ipc_callid_t callid)
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{
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    if (list_empty(&cs_req)) {
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        /* There was no pending connection request. */
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        printf(NAME ": Unexpected clonable server.\n");
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        ipc_answer_0(callid, EBUSY);
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        return;
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    }
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    cs_req_t *csr = list_get_instance(cs_req.next, cs_req_t, link);
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    list_remove(&csr->link);
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    /* Currently we can only handle a single type of clonable service. */
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    assert(csr->service == SERVICE_LOAD);
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    ipc_answer_0(callid, EOK);
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    ipc_forward_fast(csr->callid, phone, IPC_GET_ARG2(csr->call),
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        IPC_GET_ARG3(csr->call), 0, IPC_FF_NONE);
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    free(csr);
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    ipc_hangup(phone);
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}
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/** Connect client to clonable service.
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 *
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 * @param service Service to be connected to.
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 * @param call    Pointer to call structure.
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 * @param callid  Call ID of the request.
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 *
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 * @return Zero on success or a value from @ref errno.h.
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 *
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 */
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void connect_to_clonable(ipcarg_t service, ipc_call_t *call,
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    ipc_callid_t callid)
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{
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    assert(service == SERVICE_LOAD);
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    cs_req_t *csr = malloc(sizeof(cs_req_t));
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    if (csr == NULL) {
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        ipc_answer_0(callid, ENOMEM);
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        return;
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    }
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    /* Spawn a loader. */
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    int rc = loader_spawn("loader");
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    if (rc < 0) {
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        free(csr);
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        ipc_answer_0(callid, rc);
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        return;
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    }
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    csr->service = service;
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    csr->call = *call;
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    csr->callid = callid;
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    /*
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     * We can forward the call only after the server we spawned connects
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     * to us. Meanwhile we might need to service more connection requests.
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     * Thus we store the call in a queue.
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     */
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    list_append(&csr->link, &cs_req);
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}
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/**
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 * @}
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 */